Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

918
FXUS63 KLOT 080745
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
145 AM CST Sun Mar 8 2026

.KEY MESSAGES...

- Potential for severe thunderstorms and heavy rain/localized
  flooding Tuesday afternoon into Tuesday evening.

- Unseasonably warm and breezy conditions through Tuesday.

- Possible pattern shift to colder with snow chances next
  weekend.

&&

.DISCUSSION...
Issued at 145 AM CST Sun Mar 8 2026

Low clouds continue to shift east across the area early this
morning and expect these to be east of the area by mid morning
with mostly sunny skies today. High temps today will reach into
the lower 60s for most areas and into the lower 70s on Monday.
Southwest winds are expected to gust into the 25-30 mph range
both days which will prevent any lake cooling. The models are
showing a weak disturbance lifting northeast across the Ohio
Valley Monday afternoon into Monday night with the southeast cwa
on the northwest side of this wave. Some increase in cloud
cover is possible though some of the cams are suggesting a few
showers or sprinkles in the far southeast cwa. Confidence too
low to include any mention at this time.

Attention then turns to a cold front moving south across the
Great Lakes region Monday night as a storm system develops over
the Plains and tracks northeast along this frontal boundary,
which as trends show now would be across the local area/cwa.
Temperature forecasts for Tuesday (especially for northeast IL)
will be challenging over the next few days as the models vary
with the location of the front. But temps south of the front may
reach well into the upper 70s and may even tag lower 80s in a
few spots. North of the front, temps could easily be in the 40s,
to even upper 30s along the north shore. Eventually, fog mention
will likely be needed for the nearshore waters and perhaps
inland areas.

The cold front will slowly move south across northern IL, though
whether that is earlier (Tuesday afternoon) or later (Tuesday
evening) is uncertain, though a faster push south is certainly
more probable this time of year. As the main surface low
approaches, scattered thunderstorms are expected to develop
during the afternoon. Some of these thunderstorms will have the
potential to become severe, especially along and south of the
cold front, wherever that location ends up being. In addition,
with precipitable water values into the 1.5 inch range by
Tuesday afternoon, which then continues into Tuesday night,
heavy rain will be possible, which could train over the same
areas leading to a localized flooding potential. Colder air
spreading in behind this system could allow remaining rain on
Wednesday to mix with or change to light snow. Though from this
distance, it appears the snow would be light enough and temps
marginal enough to prevent much of any accumulation.

The pattern then looks to remain active through next weekend
with a clipper like system moving across the upper midwest and
northern Great Lakes region Thursday night into Friday morning.
Current trends would suggest the southern edge of the precip
with this system may reach the northern cwa with a strong cold
front possibly moving through the area Friday morning along with
windy conditions.

While its way too early for specifics, there has been relatively
good agreement among the models the past several days for a
storm system across the region next weekend. The track of this
system will be important for precip type and current blended
guidance has some rain/snow mix during this time period. cms

&&

.AVIATION /06Z TAFS THROUGH 12Z MONDAY/...
Issued at 1123 PM CST Sat Mar 7 2026

The back edge of extensive MVFR stratus is expected to move
eastward across the terminals generally in the 09-12Z window.
As this occurs, LLWS will materialize as a southwesterly low-
level jet intensifies in the region (around 50kt at 2kft). By
mid-morning, diurnal mixing will build into the base of the
weakening low-level jet support a quick uptick in southwesterly
surface gusts to 25-30kt. Gusts should settle in the 20-25kt
through the afternoon and continue after sunset. FEW to SCT mid-
to upper-level cloud decks will stream overhead from time to
time tomorrow afternoon and evening.

Borchardt

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory until 6 PM CST this evening for the IL
     and IN nearshore waters.

&&

$$

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